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Question

The electrons of H is excited to 4th excited state. Total number of lines in  ultraviolet region of H spectrum will be 
  1. 5
  2. 4
  3. 3
  4. 6


Solution

The correct option is B 4

Ultraviolet region corresponds to lyman spectrum and 4th excited state corresponds to n = 5.
Hence the number of lines in the Lyman series = n21 = 5 -1 =4

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